login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A179692 Numbers of the form p^9*q where p and q are distinct primes. 6
1536, 2560, 3584, 5632, 6656, 8704, 9728, 11776, 14848, 15872, 18944, 20992, 22016, 24064, 27136, 30208, 31232, 34304, 36352, 37376, 39366, 40448, 42496, 45568, 49664, 51712, 52736, 54784, 55808, 57856, 65024, 67072, 70144, 71168, 76288, 77312, 80384, 83456 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

Will Nicholes, Prime Signatures

FORMULA

Solutions of the equation tau(n^9)=41*tau(n). - Paolo P. Lava, Mar 18 2013

MAPLE

A179692:=proc(q) local n;

for n from 1 to q do if tau(n^9)=41*tau(n) then print(n); fi; od; end:

A179692(10^10);  # Paolo P. Lava, Mar 18 2013

MATHEMATICA

f[n_]:=Sort[Last/@FactorInteger[n]]=={1, 9}; Select[Range[90000], f]

PROG

(PARI) list(lim)=my(v=List(), t); forprime(p=2, (lim\2)^(1/9), t=p^9; forprime(q=2, lim\t, if(p==q, next); listput(v, t*q))); vecsort(Vec(v)) \\ Charles R Greathouse IV, Jul 24 2011

CROSSREFS

Cf. A006881, A007304, A065036, A085986, A085987, A092759, A178739, A179642, A179643, A179644, A179645, A179646, A179664, A179665, A179666, A179667, A179668, A179669, A179670, A179671, A179672, A179688, A179689, A179690, A179691.

Sequence in context: A088362 A045123 A252419 * A105923 A229507 A203981

Adjacent sequences:  A179689 A179690 A179691 * A179693 A179694 A179695

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jul 24 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 22 12:42 EDT 2019. Contains 327307 sequences. (Running on oeis4.)